One of the first things we learn in school is that it isn't enough to "know something."

This lesson introduces us to the problem of epistemology, the branch of philosophy concerned with how we distinguish belief from knowledge. Whenever we confidently blurted out an answer, the teacher responded with the same inescapable question: How do you know?

For years we practiced answering it. In math, we showed our work. In English, we anchored our interpretations in the text. History demanded primary sources; science required experiments that somebody else could reproduce. Even playground disputes operated under a primitive law of evidence. Before the teacher decided who started the fight, somebody usually had to produce a witness.

At least that's how I remember it.

At the time, those exercises felt like academic bureaucracy designed to improve grades. Looking back, they seem more like preparation for citizenship.

Modern democracies ask millions of strangers to cooperate without trusting one another much. We disagree about taxes, religion, immigration, foreign policy, baseball and barbecue. The system functions because we share certain rules about evidence. Courtrooms require sworn testimony. Journalists seek independent confirmation. Scientists publish methods so other scientists can replicate their experiments. Historians produce documents instead of rumors. In every case, the burden of proof belongs to the person making the claim.

Francis Bacon recognized this at the beginning of the scientific revolution. "If a man will begin with certainties," he wrote, "he shall end in doubts; but if he will be content to begin with doubts, he shall end in certainties." Three centuries later,........

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